The question about the number of compressors in an LG refrigerator often arises among buyers who want to choose the most reliable and energy-efficient equipment. The answer to this is not as clear as it might seem at first glance, since the Korean concern uses several generations of cooling technologies in its models. Most modern units are equipped with a single motor, but there are also more complex configurations that provide a premium level of comfort.
Understanding the design of the cooling system is critical to assessing the durability of the device and the potential costs of its maintenance. Inverter compressor, which LG now installs in the vast majority of its refrigerators, is fundamentally different from its old noisy counterparts in the operating principle. It is capable of changing the speed of rotation of the shaft, which allows you to maintain the temperature with high accuracy without constant switching on and off.
In this article we will analyze in detail how LG refrigerators are designed, what is the difference between linear and conventional inverter type, and also why the presence of two compressors today is considered the exception rather than the rule. You will learn how to determine the type of motor by marking and what to look for when choosing, so as not to overpay for unnecessary functions.
The general concept of LG compressor systems
The LG Electronics company has been relying on inverter technologiesfor more than ten years. This means that instead of the traditional start-stop cycle found in older refrigerators, the motor runs continuously, but at varying speeds. This approach can significantly reduce noise and vibration levels, as well as extend the service life of mechanical parts. In the standard configuration of budget and mid-range models, you will find one compressor that ensures the operation of both the freezer and refrigeration chambers.
However, speaking of “quantity”, one cannot fail to mention the unique development of the brand - Linear Inverter Compressor. This is not just a motor with a frequency converter, but a device with a reciprocating piston movement, devoid of a crank mechanism. It is this technology that has allowed LG to offer a 10-year warranty on the compressor in many regions. In such models, one unit is physically installed, but its efficiency is comparable to the operation of two independent systems in older devices.
It is worth noting that in the premium model range, especially in large-volume refrigerators (more than 600 liters) or Side-by-Side format, engineers sometimes resort to installing two compressors. This is done in order to completely separate the cooling circuits and independently control the temperature in each compartment. However, with the introduction of the system No Frost and the improvement of control algorithms for one powerful inverter, the need for two motors has practically disappeared.
⚠️ Attention: When purchasing used equipment or models produced more than 10 years ago, there is a high probability of encountering a classic two-compressor unit. In modern LG catalogs (2020-2026), such models are practically not represented.
Differences in the number of motors directly affect energy consumption. One modern inverter compressor consumes less electricity than two old engines combined. This is achieved due to the absence of starting currents, which are the main “eater” of energy when the motor starts.
Single-compressor models: industry standard
The vast majority of LG refrigerators on the market are single-compressor. This means that one unit is responsible for circulating the refrigerant throughout the entire circuit. The separation of temperature zones in such models is carried out not due to separate motors, but thanks to a system of dampers and independent evaporators. The technology Multi Air Flow allows cold air to be supplied evenly, creating optimal conditions for storing products.
The main advantage of this scheme is its compactness and maintainability. Located in the lower part of the housing (usually at the back), the compressor is easily accessible to the technician in the event of a breakdown. In addition, the absence of a second motor reduces the overall weight of the device and reduces the number of vibration points, which has a positive effect on acoustic comfort in the kitchen.
It is important to understand that “one compressor” does not mean “one cooling zone”. Modern LG models with one motor often support the Total No Frostfunction, preventing the formation of ice in all chambers. The control is carried out by an electronic unit that reads the readings of temperature sensors and regulates the power of the compressor.
- 🔹 Efficiency: Reduced energy consumption due to the absence of peak loads on the network.
- 🔹 Silence: The noise level of modern models with one inverter motor does not exceed 36-39 dB.
- 🔹 Reliability: Fewer moving parts reduce the likelihood of mechanical failure.
- 🔹 Price: The cost of single-compressor models is significantly lower than analogues with two motors.
If you are choosing a refrigerator for a standard family of 3-4 people, a single-compressor model with a volume of 300-400 liters will be more than enough. It will ensure stable temperature and food safety without unnecessary electricity costs.
Two-compressor systems: where are they found?
Although modern LG lines have moved away from using two compressors, in the past (until about 2015-2017) such a scheme was popular in high-end models and large refrigerators. The principle of operation was that one motor served the freezer compartment, and the second - the refrigeration compartment. This made it possible to achieve ideal independence: you could defrost one circuit without affecting the other, or turn off the freezer while on vacation.
Currently, dual-compressor circuits in LG refrigerators can be found in the following cases:
- 🔸 Wine cabinets: Some specialized models for storing wine may have separate circuits for different temperature zones.
- 🔸 Industrial series: Refrigeration equipment for restaurants and shops where enormous power and reliability are required.
- 🔸 Old top models: Units manufactured 8-10 years ago, which can still be used.
From a technical point of view, two compressors create more points of potential failure. If a capacitor or relay breaks in a single-motor system, the entire refrigerator breaks down. In a dual-engine system, failure of one unit will leave the second chamber working, which is a definite plus in terms of product safety, but a disadvantage for the owner’s wallet due to the complexity of repairs.
⚠️ Attention: Replacing a compressor in a dual-engine system is an expensive procedure. Often the cost of work and spare parts can reach 50-60% of the price of a new refrigerator, which makes repairs economically unfeasible.
Why did LG abandon two compressors?
The abandonment of two compressors in household models is due to the development of inverter technologies. A modern linear inverter compressor has enough capacity to quickly cool a large volume and then maintain the temperature at minimum speed. This makes the second motor an redundant element, which only increases the cost, weight and noise of the device without a real increase in the quality of food storage.
Linear inverter compressor: operating features
The key element that determines the number and type of motors in LG refrigerators is technology Linear Inverter. Unlike traditional piston compressors, where a motor rotates a shaft that moves a piston through a crank, a linear compressor moves a piston directly. An electromagnetic coil creates a magnetic field that moves the piston back and forth. This eliminates friction points, reducing noise and wear.
This design allows the compressor to operate over a wide power range. When you open the door and load warm food, it runs at 100% power. When the temperature is reached, it goes into maintenance mode, consuming a minimum of energy. It is thanks to this technology that LG was able to reduce the number of compressors to one without loss of performance.
You can visually distinguish a refrigerator with a linear compressor by the sticker on the case or in the instructions, where it will be indicated Linear Inverter Compressor. This is also often evidenced by an increased warranty from the manufacturer - up to 10 years for the compressor itself (subject to professional installation and registration).
| Characteristics | Conventional inverter | Linear inverter (LG) |
|---|---|---|
| Type movement | Rotational | Reciprocating |
| Friction points | Many (bearings, connecting rods) | Minimum (only piston) |
| Noise level | Medium (38-42 dB) | Low (36-39 dB) |
| Energy efficiency | High | Maximum (Class A++ and higher) |
| Service life | Standard | Increased (up to 20 years) |
Using a linear compressor allows you to achieve more precise temperature control. The temperature spread inside the chamber is less than 0.5 degrees, which is critical for storing perishable foods, meat and fish.
How to determine the number of compressors before purchasing
If you are in a store or studying the characteristics on the website, you can determine the number of compressors in several ways. The most reliable is studying technical documentation. The compressor type is always indicated in the “Characteristics” or “Description” section. If “inverter” is indicated in the singular and separation of circuits is not mentioned, most likely there is only one motor.
Also pay attention to the noise level. Models with two compressors, even modern ones, are usually noisier due to the presence of two sources of vibration. If the specifications state a noise level of 36-38 dB, this is almost guaranteed to be a single-compressor model with a linear motor. For comparison, old two-compressor refrigerators made noise at the level of 42-45 dB.
Another marker is energy consumption. Single-compressor inverter models consume about 220-300 kWh per year. If consumption is stated above 350-400 kWh for a standard volume, this may indicate a less efficient design or the presence of two motors (in older models).
☑️ Check before purchasing
Feel free to ask consultants about a specific model. The phrase “how many cooling circuits” is often tantamount to the question of the number of compressors in the context of older models, but in the new LG one compressor can serve two independent circuits through a valve system.
Advantages and disadvantages of different schemes
To summarize the comparison, we can highlight the key aspects that influence the user's choice. LG single-compressor inverter-controlled models win in most respects for normal household use. They are quieter, more economical and more compact.
Two-compressor circuits, a thing of the past, had their advantages in the form of complete isolation of odors and independence of circuits. However, modern air filtration systems Hygiene Fresh+ and precise electronic control of dampers have solved the problem of odors without the need to install a second motor.
- ✅ Advantages of one compressor: Low price, quiet operation, space saving, ease of repair.
- ❌ Disadvantages of one compressor: In case of breakdown motor, the refrigerator stops cooling completely (although this is rare for inverters).
- ✅ Advantages of two compressors: Theoretical possibility of one chamber operating if the other breaks down (relevant for older models).
- ❌ Disadvantages of the two compressors: High noise, high energy consumption, high cost of ownership.
⚠️ Attention: Technical characteristics and equipment of models may vary depending on the region of delivery and year of manufacture. Always check the information on the manufacturer's official website or in the instructions for a specific device.
When choosing an LG refrigerator today, you will almost certainly get a modern single-compressor model with a linear inverter motor. This is the optimal balance between performance, reliability and cost of ownership.
Frequently asked questions (FAQ)
Is it possible to replace a conventional compressor with a linear one in an old LG refrigerator?
Technically this is possible, but it is extremely difficult and expensive. Linear compressors require a special control module, which is different from standard inverter boards. In addition, they have different dimensions and mounting points. In 99% of cases, such a replacement is not economically feasible - it’s easier to buy a new refrigerator.
Is it true that the LG linear compressor is afraid of voltage surges?
Yes, the electronics of inverter compressors are sensitive to voltage surges in the network. However, modern LG models have built-in shock protection. However, to extend the life of expensive equipment in homes with an unstable electrical network, it is recommended to use a voltage stabilizer.
How to understand that the compressor is not working correctly?
Signs of a malfunction may be: constant operation of the motor without stopping (humming), lack of cold when the fan is running, excessive heating of the back wall of the refrigerator, or, conversely, a complete absence of vibration and the sound of a running motor when the power is on.
Is there a difference in electricity consumption between one and two compressors?
Yes, significant. Two old compressors consume significantly more energy than one modern inverter compressor. The difference in electricity bills can reach 30-40% per year in favor of a single-compressor inverter model.